Hey Andrew,
I wasn't familiar with the type of game this was referencing to, but after reading the comments it's more clear to me now!
I like the simple setup of the board and how you have made different levels for this same board!
The game plays pretty nicely, but I also was having difficulties understanding the durability and what should I be doing in the game other than killing skeletons :) I think after few tries I understood the spawning, but why sometimes the items destroy and sometimes no? Is this intended or not? At least it could use some communication to the player so player could make a more meaningful choice(s).
Suggestion: Add an directionality indicator (an arrow?) so player knows where the knight would be launched. I wonder if it would make sense to prototype also different launch velocities? Maybe player by dragging could launch the knight faster? And with a shorted drag it would launch slower?
I like the art style and atmosphere in this one! I am looking forward to see how you take this forward!
Cheers!